Rotary valve spring



FIG. 1 is a perspective view of the rotary valve spring, showing my design;

FIG. 2 is a left side elevation of the rotary valve spring of FIG. 1;

FIG. 3 is a right side elevation of the rotary valve spring of FIG. 1;

FIG. 4 is a top view of the rotary valve spring of FIG. 1;

FIG. 5 is a bottom view elevation of the rotary valve spring of FIG. 1;

FIG. 6 is a front elevation of the rotary valve spring of FIG. 1; and,

FIG. 7 is a rear elevation of the rotary valve spring of FIG. 1. 

CLAIM The ornamental design for a rotary valve spring, as shown and described. 